About 4 & a half years for mine and female Maroon (purchased as a juvenile) has been in there since shortly after set up. Blue Devil Damsel added at the same time died about a year ago. One of my Mandarin Dragonets has also been in there since it was a juvenile 4 years ago. Yellow Tang & Singapore came with a used 65 I purchased 3 years ago, no idea of age while with original owner. More recent additions are another juvenile Mandarin & Yellowtail Damselfish.
Don't really consider any of them senior citizens, but with a little luck, who knows. Female Maroon has had a partner for 3 years now & they're spawning away fairly consistently.
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